I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.

A．should

B．could

C．would

D．might

如右图所示的甲、乙两个装置中，胶头滴管中吸入某种液体，平底烧瓶中充入（或放入）另一种物质，挤压胶头滴管加入液体，一段时间后两装置中的气球都明显胀大．则滴管和烧瓶中所用试剂不可能是 

A、甲瓶：稀硫酸和铜片

B、甲瓶：白醋和水垢

C、乙瓶：水和硝酸铵

D、乙瓶：烧碱溶液和二氧化硫气体